UREA-INDUCED AMMONIA TOXICITY IN AEROBIC RICE Van Ryan Haden Ph.D.
In aerobic rice cultivation well developed root system plays a vital role in uptake of nutrients and water. Thus, application of RDF, FYM, Biofertilizers and FeSO4 along with integrated weed management practices is helpful in getting better development of roots consequently helpful in getting higher grain and straw yield.
Topic: Thesis On Aerobic Rice – 744963
Drip fertigation once in twoand four days with 50 per cent WSF and 50 per cent NF combination realized highergrain yield (11331 and 10569 kg ha-1), net returns (` 113726 and 102165 ha-1) and B:Cratio (2.65 and 2.49) respectively, in aerobic rice
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
----- July 14, 2017 -----
GHG emission measurement
Ms. Trang Hoang and Mr. Oliver Larsen measured the GHG emission from the rice field using the closed chamber with the gas monitor four times per week. The measurement base now is equipped with the rain protection foil.
Striding towards aerobic rice cultivation - a review.
Biological wastes (sawdust, rice husk, coir pith and charcoal) and a naturally occurring mineral (vermiculite) were successfully used to reduce the Cr concentrations in tannery effluent. Batch and column experiments were performed and the adsorption capacities of the substrates were also evaluated using isotherm tests and computing distribution co-efficient. The sawdust exhibited a higher adsorption capacity (k = 1482 mg kg-1), followed by coir pith (k = 159 mg kg-1). The biosorbent and mineral vermiculite in columns were found very effective in removing Cr from tannery effluent. About 94% removal of Cr was achieved by a column of coir pith and equally (93%) by a column containing a mixture of coirpith and vermiculite ().
Physiology and modelling of zinc allocation in aerobic rice (2008 ..
The tannery effluent carrying hazardous Cr (VI) species due to the oxidation of Cr (III) species is found to pollute the soil and the ground water. Biosorption of the Cr (VI) onto the cell surface of fungal species in aerobic condition. Batch experiments were conducted with various initial concentrations of chromium ions to obtain the sorption capacity and isotherms. The results obtained at pH 5.5 of chromium solution were 97.39% reduction by non pathogenic species of . It was found that the sorption isotherms of fungi for Cr (VI) appeared to fit Freundlich models. The fungal surfaces showed efficient biosorption for Chromium in Cr+6oxidation state. Best results for sorption were obtained at 5.5-5.8 pH, at low or high pH values, Cr (VI) uptake was significantly reduced.
Drip irrigation studies were conducted in aerobic rice ..
Coagulation considerably reduced the concentration of sulfide and improved the anaerobic treatability lead to a reduction in waste disposal costs for tannery industries. Both aluminium sulphate and ferric chloride coagulants provided excellent sulfide removal (>71%), even at a low dose of 50 mg L-1. Coagulation at pH 7.5, removed at least 32% of COD, 64% of SS, 77% of chromium, 80% of sulfide and 85% of colour. Incorporation of coagulation prior to digestion resulted in an increased capacity of the digesters and improved digestion performance. An anaerobic digestion was carried out on initial samples and supernatants from the coagulation at a hydraulic retention time of 10 days with a loading rate of 0.33 kg COD/m3/day. A methane yield of 0.2 l CH4/(g COD removed) was achieved, while COD removal was 77% and COD removal rate was 0.24 kg COD/m3/day. The combined system provided a residual COD of less than 760 mg L-1 and a residual sulfide of less than 200 mg L-1. The results also demonstrated that a sulfide concentration in excess of 260 mg L-1 completely inhibited methane production ().
The Importance And Production Of Rice
Degradation of leather industry wastewater by aerobic treatment incorporating Fenton's reagents and combined treatment was studied by . The sole treatment by Fenton's oxidation involving the introduction of 6 g FeSO4 and 266 g H2O2 in a liter of wastewater at pH of 3.5 and 30°C for 30 min at batch conditions reduced COD, BOD5, sulfide, total chromium and color up to 69, 72, 88, 5, 100% and alone showed maximum reduction to an extent of 77, 80, 85, 52, 89 respectively in 21 d treatment at pH 2.5, FeSO4-16 g L-1 and temperature of 30°C. The combined treatment at batch conditions involving 30 min chemical treatment by Fenton's oxidation followed by 72 h biochemical treatment by at batch conditions gave rise up to 93, 98, 72, 62 and 100% removal efficiencies of COD, BOD, sulfide, chromium and color at pH of 2.5 and 30°C. They observed a decrease in photo absorption of the Fenton's reagent treated samples, as compared to the blanks, at 280, 350 and 470 nm wave lengths. This may be the key factor for stimulating the biodegradation by .